Is data aggregation in you roadmap? For example, I would like be able to have daily sum of my electricity consumption, based on my momentary samples. This could be like a new stream. The data would be aggregated from my other stream(s) samples. Ofcourse I could do it already by myself, by reading all the data and then store my calculations to another stream. But this would be waste of network bandwidth.
The statistics of a stream is quite near, but I should hava a possibility to make a new aggregated stream, and select some simple calculations and calculating / storing interval for it.